James booth



lrited' Statut @met @bibitem Letters Patent No. 101,220, dated lila/rch29, 1870.

IMPROVEMENT 1N SHBARS.

The Schedule .referred to in there Lettera Patent and making part of thelame To all whom it 'may' concern Be it known that I, JAMES BOOTH, ofWorcester, in the county of Worcester and State of Massachusetts, haveinvented a new and useful improvement in Adj ustable Shears; and I dohereby declare that the following is a full, clear, and exactdescription thereof, which will enable others skilled in the art to makeand use the same, reference being had to the accompanying drawingsforming part of this specification.

This invention relates to improvement in adjusting apparatus forbook-binders, Aand other shears for cutting broad sheet-s, and consistsin the application, in the axis of the hollow hub, of the moveableshear-arm of an adjustiug'center block, on which it is suspended bycenter pins, and against which center screws tapped through the hub workin a manner to adjust the hub and shear-arm, all as hereinafter morefully specified. Figure 1 is an end elevation of mv improved shea's, and

Figure 2 is a plan view sectioned through the hub.

A is tbe'bed, and

B the stationary cutter fixed thereto;

C is the vibrating cutter, and`Dthe hub thereof.

This hub has a 'large axial hole at right angles to 'the cutting-edge,in which a-c'entering block, E, is

arranged so as to vibrate in the plane of the cuttingbed A, or in aplane parallel thereto, and fitted with sockets in the ends for thereception of the centering- Apins F. This block is narrower than theaxial hole of the hub in the horizontal direct-ion,-and has a convex orother suitably-formed projection G, at the center on one side, andset-screws, H, are tapped through the wall of' the hub against it on theother side, by which the hub and the blade, C, may be adjusted to rightor lett as required, the block E being confined between the centers, sothat the movable blade may be adjusted to a parallel position with thefixed cutter in a ready and simple manner.

AThe said blade, C, may be. adjusted wholly to or from.

the fixed cutter by the centers F. A set-screw, I," is tapped throughthe hub against the upper face ofthe block E, to prevent any movement ofit relatively to the hub in that direction, and for clamping it tightlyin place after the adjustment.

Having thus described my invention,

I claim as new and desire to secure by Letters Patent- 1. Thecombination with the hub of the movable knife ot' the adjustingcentering-block E, and the setscrew H, substantially -as specitied.

2. The combination with the hub D, and tue adjusting-block E, oftheset-screw I, substantially as specilied.

The above specification ot' my invention signed by me this 3d day ot'February, 1870.

JAMES BOOTH.

Witnesses:

WM. Boo'rH, WM. A. MORGAN.

